Engineering of Quantum Hall Effect from Type IIA String Theory on The K3 Surface

TL;DR

This paper constructs string theory models of the Quantum Hall Effect using D-branes on K3 surfaces, revealing new realizations linked to different algebraic classifications and fractional or negative filling fractions.

Contribution

It introduces novel stringy realizations of QHE on K3 surfaces based on algebraic classifications, expanding the understanding of fractional and negative filling fractions.

Findings

Finite Lie algebras yield fractional filling fractions.

Indefinite geometries classify models with negative filling fractions.

Affine Dynkin diagrams do not support stringy QHE in 1+2 dimensions.

Abstract

Using D-brane configurations on the K3 surface, we give six dimensional type IIA stringy realizations of the Quantum Hall Effect (QHE) in 1+2 dimensions. Based on the vertical and horizontal lines of the K3 Hodge diamond, we engineer two different stringy realizations. The vertical line presents a realization in terms of D2 and D6-branes wrapping the K3 surface. The horizontal one is associated with hierarchical stringy descriptions obtained from a quiver gauge theory living on a stack of D4-branes wrapping intersecting 2-spheres embedded in the K3 surface with deformed singularities. These geometries are classified by three kinds of the Kac-Moody algebras: ordinary, i.e finite dimensional, affine and indefinite. We find that no stringy QHE in 1+2 dimensions can occur in the quiver gauge theory living on intersecting 2-spheres arranged as affine Dynkin diagrams. Stringy realizations of QHE can be done only for the finite and indefinite geometries. In particular, the finite Lie algebras give models with fractional filling fractions, while the indefinite ones classify models with negative filling fractions which can be associated with the physics of holes in the graphene.